Gionee Communication Equipment — Screen damage during repair

I own a gionee s6 phone. Recently, the battery charging board of the phone got damaged on its own and i took the phone to a gionne care centre. They told me that the repair can be done only by opening the phone with a machine which uses vacuum and there is 50% chance of screen/display getting broken during the opening process.
To my surprise, they informed - it is the customer (Myself) who pays for the new screen/display as well!! The total bill of repair will be 4700 rupees!!! I am paying this much because my phone's screen is broken due to company's sole, defaulty way of opening the gionee handset. So, a charging board repair which should have normally costed me around 1000 bucks will now cost almost 5000 bucks because the company's repair unit fails to open my phone without breaking its display.
Im sorry to say but i feel betrayed and dejected to have invested my money in this phone. I did not expect this kind of customer service and repair.
If the display is broken by the company, the company should bear its cost, not the customer!!!